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TRICHOMONIASIS

Nebraska Department of AgricultureBureau of Animal IndustryDr. Dennis HughesState Veterinarian

JUST WHAT IS TRICHOMONIASIS OR “TRICH”?

Venereal disease in cattle;

Causes infertility, open cows and occasional abortions in cows and heifers;

Can be economically devastating and costly to eradicate from a herd;

WHAT CAUSES TRICHOMONIASIS ?

Mobile, complex, three-haired, single-celled organism, protozoan, called Tritrichomonas foetus;Organism survives in microscopic folds of skin that line the bull’s penis and internal sheath;

WHAT CAUSES TRICHOMONIASIS (CONT’)

In the cow or heifer, the organism lives in the vagina and uterus until her immune system eventually destroys it;

This destruction process (immunity) may not occur for 3 – 20 weeks, and the immunity is short lived so a cow or heifer can become infected again;

University of Missouri - Extension

HOW IS TRICH TRANSMITTED?

Transmitted from cow to cow by the bull – nearly always a disease of cattle who are naturally bred;Transmitted via sexual contact with an infected mate;Rare cases of transmission through artificial insemination;

TRICH IN THE COW

Cow does not appear ill;Infected during breeding;The cow may show a subtle, mild, vaginal discharge, 1 – 3 weeks later (pyometra);Protozoa attach to the lining of the reproductive tract;An inflammatory response occurs, resulting in the death of the embryo;Repeated breedings;Wide ranges of gestational ages at pregnancy checks;

TRICH IN THE BULL

No signs: semen quality and sexual behavior are not affected;Trich lives in the crypts (folds) inside the sheath. Crypts deeper in older bulls;As the bull ages, the skin grows, folds increase in the penis and sheath, creating additional places for the organism to thrive;Older bulls (over 3 years) more likely to become chronically infected than younger bulls;

WHAT IF ‘TRICH’ GETS INTO MY HERD ?

In herds with a new infection, a 50-70% calf crop is common, strung out over 3 – 8 months;Embryo dies within the first 18 days; cow may stay on 21 day cycle;Usually, embryo dies at 50-60 days; cow will recycle;Abortion can occur at 7-8 months, rarely go to term;

DISTRIBUTION OF CASES IN AN INFECTED HERD

Drovers / Cattle Health Tech

SAMPLE COLLECTION FROM THE BULL

SAMPLE COLLECTION FROM THE BULL

DIAGNOSISBull becomes lifetime carrier;Best to test after 2 weeks sexual rest;Sometimes observed under scope immediately;Usually culture for 1 to 7 days;If even one bull is positive, you haveto assume that the herd has been exposed!

********************Cows usually clear infection rapidly;

Test soon after embryo death

Suggestive history not obtained until several months later;

HOW ACCURATE IS THE TEST?

Per the University of NE diagnostic lab:Current diagnostic methods will detect 80-90% of infected bulls with a single test;Repeating this test up to 3 times at 1-2 weeks intervals increases test accuracy;There are look-alike organisms and PCR testing has improved diagnostic efficiency;

TESTS AVAILABLE FOR TRICHPCRPolymerase Chain

Reaction;Differentiate contaminate

trichomonads;

In Pouch TFConvenient;

Diamonds MediaSome Labs Prefer;

Culture

HOW IS THE DISEASE CONTROLLED?

Trichomoniasis is a complex problem and your veterinarian should always be consulted regarding decisions about diagnosing, preventing, or controlling, this disease;It is easier to prevent the infection than to try to control it after it enters the herd;

PREVENTATIVE MEASURES

Drovers / cattle health tech

NE DEPT OF AGRICULTURE

In 2007, the NE State Veterinarian entered into discussions with the Department, veterinarians and producers at association meetings, and various conferences, on ways to control Trichomoniasis in bovine herds across the state;

IMPORT ORDER

January 2008, the Department of Agriculture developed an import order for cattle entering the state.

PURPOSE: Protect the health of Nebraska livestock;GOAL: Maintain the strength of our exports and

respond to the need expressed by the industry;

NEBRASKA IMPORT ORDER

AFFADAVIT FORM FOR AUCTION MARKETS

OTHER STATES MONITORING TRICH

CaliforniaColoradoIdahoMontanaNew Mexico South DakotaUtahWyoming

Nebraska and North Dakota have implemented Import Orders for monitoring. The following states have developed more

comprehensive Trich eradication and testing programs:

FUTURE DISCUSSIONS ON TRICH

This presentation has been a collaborative effort between the:

NE Department of Agriculture and University of NE Diagnostic Laboratory.